Dan Air makes an important point, when the tail is unaffected by the down wash from the wing, natural stall warning doesn't exist. Hence the stick shakers/pushers on aircraft of these configurations, which works well as the tail won't be in the turbulent air at the stall warning speed.
A more problematic characteristic is the tendency for t-tails with aft mounted engines to pitch up on stalling, making things worse if the tail has already become ineffective. i imagine the abscence of this quality on the 146/RJs is to do with their engine installation position.
Regards, BGPM.